One advantage i forgot to tell i had the opportunity to directly compare a breast waterwhell (zuppinger) and the screw. one point is, that the screw produced significantly less noise than the waterwheel, which was covered!!! at sites in the middle of villages, like mine, this is a very important point.
--- K�hli Thomas <[EMAIL PROTECTED]> schrieb: > Dear Dave > > In a few days I will do my first experiences with > the > screw, i'll met it in service. since my first post > here in this forum, a lot of time went by. this, > because i do all the work by myself in the spare > time. > but this is not the topic. > > i choosed this machine because it was the most > advantageous machine for my site conditions. > > the cost were 2/3 of a kaplan with fixed vanes. if i > had choosen the model with concrete bed it would be > half the price of what i have now. i choosed the > model > with the steel bed because i will still have the > possibility to adjust the height of in- and outlet. > but this i just for my privat r&d, not technicaly > needed. > > one advantage is the ability to let pass al kind of > debris, the trash rake bar distance is the minimal > distance wich is given by government. this will help > me to save maintenance efforts during service. > > the screw efficiency over all is very good. the peak > is 84%, droping to about 78% at 1/5 flow. mainly, > normal turbines have a higher peak efficiency, but > in > fact, the only thing which count is the amount of > electricity produced during the year and how much > work > it took you to keep the machine running. this lead > me > to choose the screw. > > the risk of injure fish is very very small, the > manufacturer has a study about this issue. the > mashine > is the most fishfriendly desgin i have seen. the > government appriciated this and pushed me to choose > this mashine > > this mashine seems to be the choice for your site. > > specs of my site: 1.15m @ 900 l/s > > with best regards > > thomas > > --- davidrichardmann <[EMAIL PROTECTED]> > schrieb: > > Dear Mr Thomas K�hli > > > > I read with interest the infomation about your > micro > > hydro plant in > > Switzerland using an archimedes screw. I have > never > > heard of this > > being used before, and am curious as to why it was > > chosen. > > Efficiency at low head? Fish protection? Cost? > > Do you have any more details of the project > > available? > > I am looking at ways to install a low head scheme > > (1.8m) in a river > > where fish protection is a major problem. What I > > really need is a > > machine that will extract the water power > > efficiently, whilst still > > permitting the safe passage of small fish through > > the unit! > > > > Thanks for your help > > > > Dave Mann > > > > > > > > > > > > > ___________________________________________________________ > Gesendet von Yahoo! Mail - Jetzt mit 100MB Speicher > kostenlos - Hier anmelden: http://mail.yahoo.de > > ___________________________________________________________ Gesendet von Yahoo! Mail - Jetzt mit 100MB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
